Analysis of Heavy Precipitation and its Typical Weather Patterns over the Upper Reaches of the Yellow River

Analysis of Heavy Precipitation and its Typical Weather Patterns over the Upper Reaches of the Yellow River | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Analysis of Heavy Precipitation and its Typical Weather Patterns over the Upper Reaches of the Yellow River Changrong Tan, Yaoming Ma, Xuelong Chen, Weimo Li, Zhengling Cai, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7486847/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 20 Apr, 2026 Read the published version in Climate Dynamics → Version 1 posted 5 You are reading this latest preprint version Abstract The frequency of disasters induced by heavy precipitation (HP) in the upper reaches of the Yellow River Basin (URYR) has increased notably. This study had further elucidated the structure and interactions of synoptic systems across different pressure levels and quantitatively characterized the anomalous driving factors. Four weather types had been identified: Xinjiang Trough (Type1, constituting 35% of HP), Mongolian Trough (Type2, 14%), Westward–Extension Western Pacific Subtropical High (WPSH) (Type3, 43%), and Cut–Off Cyclone (Type4, 8%). Influenced by the troughs, the moisture anomalies are transported by the southwesterly jet originating from Bay of Bengal low-pressure systems; mesoscale cyclones are positioned on the northwestern and northeastern margins of the URYR, respectively. In Type3, the WPSH and South Asian High demonstrate the greatest zonal expansion and central intensity (reaching 12610 gpm); the core of the mesoscale cyclone anomaly is situated in the central-northern segment distinguished by maximal moisture and energy, exhibiting the most pronounced extreme properties. The most notable characteristic of Type 4 is its stability and persistence presented the most favorable dynamic conditions, despite occurring with the lowest frequency. Moisture condition may play a more important role than dynamic in precipitation intensities over the URYR. Due to the anomalous evolution of atmospheric circulation, the anomalies in potential vorticity, vertical velocity, and moisture flux divergence vary at corresponding rates per 6-hour interval, and exhibit rapid fluctuations within 12 to 6 hours before HP. The positions of mesoscale systems and high precipitable water vaper show a correlation with the locations where HR events were recorded. The meridional moisture advection and meridional moist enthalpy serve as dominant mechanisms driving HP. These findings may offer a scientific basis for the prediction of HP events in the region. Heavy Precipitation URYR Weather Patterns Circulation anomalies Moisture budget Full Text Supplementary Files supplementarymaterial.docx Cite Share Download PDF Status: Published Journal Publication published 20 Apr, 2026 Read the published version in Climate Dynamics → Version 1 posted Editorial decision: Major Revision 31 Oct, 2025 Reviewers agreed at journal 22 Sep, 2025 Reviewers invited by journal 22 Sep, 2025 Editor assigned by journal 11 Sep, 2025 First submitted to journal 05 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7486847","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":518896729,"identity":"d2cb7dfc-dda4-4a42-92dd-5c92a80c7d3a","order_by":0,"name":"Changrong 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